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Method for purifying process condensate produced during application of catalytic dehydrogenation of ethyl benzene to produce styrene

A technology for ethylbenzene catalytic dehydrogenation production and process condensate, which is applied in chemical instruments and methods, degassed water/sewage treatment, neutralized water/sewage treatment, etc., and can solve the problem of high cost of iron removal and hydrocarbon removal. , did not consider the reduction of metal oxides or hydrocarbons, blockage of subsequent treatment systems, etc.

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, these methods do not consider reducing metal oxides or hydrocarbons from the source of generation; secondly, when the process condensate stripper is not operating normally, a large amount of styrene-containing hydrocarbons will enter the subsequent iron removal and hydrocarbon removal In such equipment, styrene polymerization will block the subsequent treatment system, which not only affects the purification and recovery of water, but also costs a lot to replace iron and hydrocarbon removal fillers

Method used

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  • Method for purifying process condensate produced during application of catalytic dehydrogenation of ethyl benzene to produce styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a styrene plant with an annual output of 120,000 tons, the amount of condensate in the process is 30-50t / h, and the amine substance added is N-methyldiethanolamine, and the amount added is 15ppm (the standard amount is acidic dehydrogenation liquid); The preferred polymerization inhibitor is diethylhydroxylamine, the amount added is 15ppm (the standard amount is the process condensate), the gas-water ratio of the stripping tower is 1000, and the temperature of the stripping gas is increased by 32.5°C after passing through the steam superheating furnace. The content of suspended solids is 4 mg / L, the total content of iron is 0.5 mg / L, and the total content of hydrocarbons is 10 mg / L.

Embodiment 2

[0032] A styrene plant with an annual output of 120,000 tons produces 30-50t / h of process condensate, and the added amine is ethylenediamine, and the added amount is 35ppm (the standard amount is acidic dehydrogenation liquid); The polymerization agent is N, 2-dihydroxy-N-(2-hydroxypropane) propylamine, the amount added is 15ppm (the standard amount is the process condensate), the gas-water ratio of the stripping tower is 500, and the stripping gas is superheated by steam The temperature behind the furnace increased by 65°C, the content of suspended solids in the effluent water was 2 mg / L, the total content of iron was 0.3 mg / L, and the total content of hydrocarbons was 9.0 mg / L.

Embodiment 3

[0034] In a styrene plant with an annual output of 120,000 tons, the amount of condensate produced in the process is 30-50t / h, and the amine substance added is methoxypropylamine, and the amount added is 20ppm (the standard amount is acidic dehydrogenation liquid); The polymerization inhibitor used is sodium nitrite, the amount added is 40ppm (the standard amount is the process condensate), the gas-water ratio of the stripping tower is 1200, the temperature of the stripping gas is increased by 27°C after passing through the steam superheating furnace, and the quality of the effluent is The content of suspended solids is 2 mg / L, the total content of iron is 0.3 mg / L, and the total content of hydrocarbons is 7.0 mg / L.

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Abstract

The present invention provides a method for purifying process condensate produced during application of catalytic dehydrogenation of ethyl benzene to produce styrene. The method is characterized in that an amine substance is added to an acidic dehydrogenation liquid to neutralize before the acidic dehydrogenation liquid enters an air cooler so as to prevent iron ion production caused by metal corrosion to the greatest extent; a polymerization inhibitor is added to the process condensate before entering a steam stripping tower, such that polymerization scaling of styrene and other components of the process condensate in the steam stripping tower is effectively controlled, and the steam stripping removing rate of hydrocarbons in the tower is increased; water from the bottom of the steam stripping tower is directly introduced into an air stripping tower without cooling so as to remove the hydrocarbons in the water and increase the stripping gas temperature, such that the thermal efficiency of the steam superheating furnace is improved; and the striped process condensate is fed into a sand filtration tower so as to remove the polystyrene formed by oxidation, colloidal hydrocarbons, metal oxides and the like.

Description

technical field [0001] The invention relates to a method for purifying the process condensate produced in the process of ethylbenzene catalytic dehydrogenation to styrene, in particular to the removal of hydrocarbons and metal oxides in the process condensate produced in the process of ethylbenzene dehydrogenation to styrene The method is more specifically a method for effectively removing hydrocarbons such as toluene, ethylbenzene, and styrene, iron ions, and catalyst dust metal oxides in the condensate. Background technique [0002] Styrene is an important raw material for the synthetic rubber and plastics industries. Catalytic dehydrogenation of ethylbenzene has always been the main method of producing styrene at home and abroad, accounting for about 85% of the production capacity of styrene. In order to ensure the normal progress of the ethylbenzene dehydrogenation reaction, high-temperature steam should be injected according to the water-oil ratio (steam / ethylbenzene, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/20C02F1/66C02F9/00
Inventor 潘罗其杜建文黄伊辉刘文杰王玉枫余卫勋
Owner CHINA PETROLEUM & CHEM CORP
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